To answer the question about multiple cables. You need to find the resistance of each cable. For example (look up or measure the real values, I'm plucking values from thin air).

1x 0GA cable has a resistance of 0.001Ohm / Metre
1x 4GA cable has a resistance of 0.005Ohm / Metre

Say you have 5 metres of cable (as most of us with Falcons and a front battery would)

The 0GA will have a total resistance of 0.005Ohm, and the 4GA a total of 0.025Ohm.

Put 100A through each (4GA maxs out at about 140A, so we're keeping safe here). And starting with a healthy 13.8V battery on alternator charge at the far end we'll be left with....
0GA - 13.3V a loss of 50W of power into the cable (heating it).
4GA - 11.3V a loss of 250W of power into the cable (heating it alot)

Now for two 4GA runs in parallel. Resistance in parallel is the average of all runs. So 2x 4GA runs will have a resistance of 0.0025Ohms per metre. Again with a 5 metre (0.0125ohm total) distance from the front battery to the amp in back with a 13.8V alternator charge, we have....
2x 4GA - 12.55V a loss of 125W into the cables (heating them).

The more 4GA runs you add the closer you'll get to the 0GA, eventually beating it.

The hardcore SPL cars, have sometimes as much as 8 times the cable they need, to ensure voltage drop is a small as possible. I've seen a SPL car with 16 runs of 0GA!

Personally, I have a single 4GA power run, and a 2GA earth run powering ~1400WRMS of amps, and a 120A circuit breaker.

SPL guys don't run fuses or breakers as they add more resistance.

edit: IRL 0GA isn't 5 times better than 4GA, it's slightly less than 2 times better, so two runs of 4GA will out perform 1 run of 0GA.

a thicker cable carries more current true, the creation of a magnetic field is directly proportional to current which flows perpondicular to the cable.

the thicker the cable the more resistance u get because of the more electrons flowing through it consequently creating heat an resistance, obviously the resistance isn't great because its metal an won't even be noticable on multimeter but in acturley fact it does create a higher electro magnetic field an more resistance.

so maby u should get ur facts right buddy.

if you don't beleive me run a 20g wire next to ur rca's then compare it to a 0g wire... n hence is y u cross rca's at 90 degrees to the power cables if u must cross them..

In simple terms:
A thicker cable doesn't mean more magnetic field - like you said yourself the magnetic field is caused by the current flowing through the cable.
The more current - the stronger magnetic field. The size of the cable doesn't have anything to do with it.
A thick cable can carry a small current too. The magnetic field would be small. If you have 10 Amps flowing through a thick cable it's the same magnetic field as a thin cable.

In advanced terms:
The formula to calculate magnetic field around a current carrying wire:
B = (µo I)/(2 pi r)
where
µo, permeability of free space = 4 pi x 10-7 Tm/A
I, current flowing through the wire, measured in amps
B, magnetic field strength, measured in Tesla
r, distance from the wire, measured in meters

So basically current (I) and distance away (r) are what determines the magnetic field at a point.

"the thicker the cable the more resistance u get because of the more electrons flowing through it consequently creating heat an resistance, obviously the resistance isn't great because its metal an won't even be noticable on multimeter but in acturley fact it does create a higher electro magnetic field an more resistance.

so maby u should get ur facts right buddy. "

Where did you get this load of dribble from as it is certainly not based on any from of electrical theory.
If a thicker cable has more resistance then it would NOT be able to carry more current as it would generate more heat and the voltage drop would be higher as well defeating the point.

So maybe you should check some electrical theory and use some actual facts before sprouting garbage like this.......
The more area of copper he lower the resistance full stop!!!!!!!!!!

bigger cable is good for everything (less resistance, more current flow, less voltage drop). The amount of magnetic field generated has nothing to do with the thickness of the cable, only how much current is flowing (true you can get more current down a thicker cable, but it's the more current making a bigger field, not the bigger cable).

lol buddy im tellin u a thicker cable gives more resistance to electrons because there are more atoms in the cable they hit each other an create more heat an resistance this has nothing to do with ohms law, this is how u get resitance over km's of cable because there are more electrons flowing thus creating more atom collisions in lamins terms.

hence y i said the resistance isn't measurable in a simple 3m setup, its apon km's of cable u get resistance. an electro magnetic field generated is directly proportional to the current passing through it.

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